Touch Wiring Overlap Layout for Lower Parasitic Capacitance
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Solution Overview
Problem
Existing touch structures in display panels, particularly self-capacitance touch structures, suffer from parasitic capacitance and visibility issues due to complete overlapping of touch wirings, leading to reduced touch accuracy and user experience.
Innovation Solution
A touch structure design where first and second wirings have overlapping parts with different extending directions, connected by through holes in the insulating layer, minimizing parasitic capacitance and ensuring electrical connectivity while maintaining a small overlapping area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch wirings are completely overlapped to ensure electrical connectivity, then electrical conductivity is improved, but parasitic capacitance increases and touch accuracy deteriorates
Solution Approach 1:
The overlapping area between first and second wirings is segmented into multiple small overlapping parts rather than a large continuous area. Each overlapping part is separated by spacing insulating layers, dividing the conductive path into discrete segments that reduce cumulative parasitic capacitance while maintaining electrical connectivity through controlled via connections.
Solution Approach 2:
The wiring structure transitions from uniform overlapping to non-uniform local overlapping. The first and second wirings overlap only in specific local areas (overlapping parts) rather than along their entire length. This local quality change reduces the total overlapping area and thus reduces parasitic capacitance while maintaining necessary electrical connections at critical points.
2Reliability
If touch wirings are completely overlapped to ensure electrical connectivity, then electrical conductivity is improved, but visibility of wirings increases and user experience deteriorates
Solution Approach 1:
The wiring pattern is segmented into discrete overlapping parts separated by spacing insulating layers. This segmentation creates a more dispersed visual pattern rather than continuous thick wiring, reducing the visible impact on the display while maintaining electrical functionality through the spaced-apart structure.
Solution Approach 2:
The first and second wirings are arranged with asymmetric overlapping characteristics - they overlap in specific directions and areas but are offset in other regions. This asymmetric arrangement reduces the overall visual footprint and creates a more balanced appearance compared to symmetric complete overlapping, improving aesthetic quality while maintaining connectivity.
3Measurement precision
If overlapping area between wirings is reduced to minimize parasitic capacitance, then touch accuracy is improved, but electrical connectivity may be compromised
Solution Approach 1:
Spacing insulating layers are introduced as intermediary elements between the first and second wirings. These insulating layers with embedded via holes serve as mediators that maintain electrical connectivity while controlling the overlapping area. The via holes in the insulating layers provide controlled connection points, ensuring reliability while the insulating material itself limits parasitic capacitance by restricting the overlap to specific regions.
Data Source
AI summary
A touch structure and a display panel, the touch structure includes a substrate and a plurality of touch units, at least one touch unit includes a first conductive layer, a spacing insulating layer and a second conductive layer; the first conductive layer includes a first pattern formed by first wirings, and the second conductive layer includes a second pattern formed by second wirings, at least one first wiring includes a first overlapping part overlapped with at least one second wiring, the at least one second wiring includes a second overlapping part overlapped with the first overlapping part, and a first segment has a different extending direction from a second segment, the first segment is a segment of the first wiring with the first overlapping part as an extending end, and the second segment is a segment of the second wiring with the second overlapping part as an extending end.